Copyright (c) 2012, 2016 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2012, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.osgi.container;

import java.util.*;
import org.osgi.framework.namespace.NativeNamespace;
import org.osgi.framework.wiring.BundleCapability;

An implementation of BundleCapability. 
Since:
3.10/**
 * An implementation of {@link BundleCapability}.
 * @since 3.10
 */
public final class ModuleCapability implements BundleCapability {
	private final String namespace;
	private final Map<String, String> directives;
	private final Map<String, Object> attributes;
	private final Map<String, Object> transientAttrs;
	private final ModuleRevision revision;

	ModuleCapability(String namespace, Map<String, String> directives, Map<String, Object> attributes, ModuleRevision revision) {
		this.namespace = namespace;
		this.directives = directives;
		this.attributes = attributes;
		this.transientAttrs = NativeNamespace.NATIVE_NAMESPACE.equals(namespace) ? new HashMap<String, Object>(0) : null;
		this.revision = revision;
	}

	@Override
	public ModuleRevision getRevision() {
		return revision;
	}

	@Override
	public String getNamespace() {
		return namespace;
	}

	@Override
	public Map<String, String> getDirectives() {
		return directives;
	}

	@Override
	public Map<String, Object> getAttributes() {
		if (transientAttrs == null)
			return attributes;
		Map<String, Object> result = new HashMap<>(transientAttrs);
		result.putAll(attributes);
		return Collections.unmodifiableMap(result);
	}

	Map<String, Object> getPersistentAttributes() {
		return attributes;
	}

	
Only used by the system module for setting transient attributes associated with the osgi.native namespace. 
Params:
transientAttrs – /**
	 * Only used by the system module for setting transient attributes associated
	 * with the {@link NativeNamespace osgi.native} namespace.
	 * @param transientAttrs
	 */
	public void setTransientAttrs(Map<String, ?> transientAttrs) {
		if (this.transientAttrs == null) {
			throw new UnsupportedOperationException(namespace + ": namespace does not support transient attributes."); //$NON-NLS-1$
		}
		if (!(getResource().getRevisions().getModule() instanceof SystemModule)) {
			throw new UnsupportedOperationException("Only allowed to set transient attributes for the system module: " + getResource()); //$NON-NLS-1$
		}
		this.transientAttrs.clear();
		this.transientAttrs.putAll(transientAttrs);
	}

	@Override
	public ModuleRevision getResource() {
		return revision;
	}

	@Override
	public String toString() {
		return namespace + ModuleRevision.toString(attributes, false) + ModuleRevision.toString(directives, true);
	}
}